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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Securities available-for-sale, amortized costs	$ 607,517	$ 530,075
Securities available-for-sale, gross unrealized gains	14,191	17,170
Securities available-for-sale, gross unrealized losses	3,952	503
Securities available-for-sale, fair values	617,756	546,742
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	182,123	86,859
Securities available-for-sale, gross unrealized gains	3,614	4,477
Securities available-for-sale, gross unrealized losses	2,101	173
Securities available-for-sale, fair values	183,636	91,163
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	197,399	196,435
Securities available-for-sale, gross unrealized gains	6,143	7,778
Securities available-for-sale, gross unrealized losses	1,728	252
Securities available-for-sale, fair values	201,814	203,961
Collateralized Mortgage Backed Securities [Member]
Securities available-for-sale, amortized costs	225,994	244,780
Securities available-for-sale, gross unrealized gains	4,128	4,473
Securities available-for-sale, gross unrealized losses	123	78
Securities available-for-sale, fair values	229,999	249,175
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	2,001	2,001
Securities available-for-sale, gross unrealized gains	306	442
Securities available-for-sale, fair values	$ 2,307	$ 2,443

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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